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Prouzet E, Kacheff A, Aubert G, Bentaleb A, Backov R, Aymonier C. Toward a sustainable preparation of tunable mesoporous silica. J Supercrit Fluids 2019. [DOI: 10.1016/j.supflu.2018.07.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2
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Lowry E, Piri M. Effect of Surface Chemistry on Confined Phase Behavior in Nanoporous Media: An Experimental and Molecular Modeling Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9349-9358. [PMID: 30008204 DOI: 10.1021/acs.langmuir.8b00986] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
It is well accepted that nanopore size is a controlling parameter in determining the phase behavior of confined adsorbate molecules. Despite this knowledge, the quantitative effect of surface chemistry on the confined phase behavior is a factor that remains obfuscated. Obtaining a complete understanding of the variables controlling confined phase behavior is a critical step in developing more complete equations of state for predictive modeling. To this end, a combined experimental and molecular modeling study was conducted to investigate the effects of surface chemistry and wetting on the confined phase behavior of propane and n-butane in modified and unmodified silica MCM-41. Isotherms were measured in four types of silica MCM-41 modified with varying sizes of alkyl groups to determine the effects of increasing surface modification. Results showed that increased pore surface coverage of carbon resulted in a notable change in the capillary condensation pressures, adsorption enthalpy, and confined critical temperature of the adsorbate. Correlations between the surface coverage of carbon and the confined critical temperature were presented and supported by thermodynamic arguments. The primary conclusions were partially supported by hybrid molecular dynamics-Monte Carlo simulations of propane adsorption in models of the four types of experimental adsorbents. Several differences were noted and explained between the experimental and modeling results. Energetic heterogeneity on the surface of the modified MCM-41 adsorbents as well as differences in adsorbate entropy induced by surface features and chemistry were suggested as primary driving factors for the observed trends. The results of this work have direct implications for improving understanding of confined phase behavior in materials of varying surface chemistries.
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Affiliation(s)
- Evan Lowry
- College of Engineering and Applied Sciences , University of Wyoming , Laramie , Wyoming 82071 , United States
| | - Mohammad Piri
- College of Engineering and Applied Sciences , University of Wyoming , Laramie , Wyoming 82071 , United States
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Guo L, Zhao X, Zhang R, Chen C, Chen J, Chen A, Liu X, Hou Z. Mesoporous spherical silica encapsulating Pd nanoparticles prepared by CO 2 -induced mircoemulsion and catalytic application in Suzuki coupling reaction. J Supercrit Fluids 2016. [DOI: 10.1016/j.supflu.2015.07.036] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pérez-Anguiano O, Wenger B, Pugin R, Hofmann H, Scolan E. Controlling mesopore size and processability of transparent enzyme-loaded silica films for biosensing applications. ACS APPLIED MATERIALS & INTERFACES 2015; 7:2960-2971. [PMID: 25574584 DOI: 10.1021/am508630c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Silica-based nanoporous thin films including large mesopores are relevant as enzyme supports for applications in biosensing. The diffusion and immobilization of large biomolecules such as enzymes in such porous films require the presence of large mesopores. Creating such morphologies based on a bottom-up synthesis using colloidal templates is a challenge in view of the combination of desired material properties and the robustness of the casting process for the fabrication of thin films. Here a strategy to reproducibly synthesize transparent porous silica thin films with submicrometer thickness and homogeneously distributed porosity is presented. For this purpose, polystyrene-poly-2-vinylpyridine (PS-P2VP) amphiphilic block copolymers are used as porogenic templates. Low-chain alcohols are employed as both selective solvents for the P2VP blocks and reaction media for silica synthesis. Rheology measurements reveal a strong influence of the block copolymer length on the behavior of PS-P2VP micelles in suspension. The pore distribution and accessibility into the film are controlled by adjusting the silica to block copolymer weight ratio. The solvent choice is shown to control not only the micelle size and the generated pore morphology but also the structural homogeneity of the films. Finally, the suitability of the synthesized films as supports for enzymes is tested using a model enzyme, horseradish peroxidase EC 1.11.1.7. Our approach is innovative, robust, and reproducible and provides a convenient alternative to synthesize large mesopores up to small macropores (20-100 nm) in nanostructured thin films with applications in biosensing and functional coatings.
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Affiliation(s)
- Oswaldo Pérez-Anguiano
- Swiss Center for Electronics and Microtechnology (CSEM) , Jaquet-Droz 1, CH-2000 Neuchâtel, Switzerland
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Marion J, Trovaslet M, Martinez N, Masson P, Schweins R, Nachon F, Trapp M, Peters J. Pressure-induced molten globule state of human acetylcholinesterase: structural and dynamical changes monitored by neutron scattering. Phys Chem Chem Phys 2015; 17:3157-63. [DOI: 10.1039/c4cp02992e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We used neutron scattering to study the effects of high hydrostatic pressure on the structure and dynamics of human acetylcholinesterase (hAChE).
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Affiliation(s)
- J. Marion
- Univ. Grenoble Alpes
- IBS
- F-38044 Grenoble
- France
- Institut Laue Langevin
| | - M. Trovaslet
- Univ. Grenoble Alpes
- IBS
- F-38044 Grenoble
- France
- Institut de Recherche Biomédicale des Armées
| | - N. Martinez
- Univ. Grenoble Alpes
- IBS
- F-38044 Grenoble
- France
- Institut Laue Langevin
| | - P. Masson
- Univ. Grenoble Alpes
- IBS
- F-38044 Grenoble
- France
- Kazan Federal University
| | - R. Schweins
- Institut Laue Langevin
- F-38042 Grenoble Cedex 9
- France
| | - F. Nachon
- Univ. Grenoble Alpes
- IBS
- F-38044 Grenoble
- France
- Institut Laue Langevin
| | - M. Trapp
- Angewandte Physikalische Chemie
- Universität Heidelberg
- 69120 Heidelberg
- Germany
- Helmholtz-Zentrum Berlin für Materialien und Energie
| | - J. Peters
- Univ. Grenoble Alpes
- IBS
- F-38044 Grenoble
- France
- Institut Laue Langevin
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Ghosh K, Rankin SE, Lehmler HJ, Knutson BL. Processing of surfactant templated nano-structured silica films using compressed carbon dioxide as interpreted from in situ fluorescence spectroscopy. J Phys Chem B 2012; 116:11646-55. [PMID: 22946494 DOI: 10.1021/jp305113b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The local environment and dynamics of compressed carbon dioxide (CO(2)) penetration in surfactant templated silica film synthesis is interpreted from the in situ fluorescence emission spectra of pyrene (Py) and a modified pyrene probe. Pyrene emission in cetyltrimethylammonium bromide (CTAB) and cetylpyridinium bromide (CPB) templated silica films is monitored immediately after casting and during processing with gaseous and supercritical (sc) CO(2) (17-172 bar, 45 °C). The solvatochromic emission spectra of pyrene in CTAB templated films suggest CO(2) penetration in both the micelle interface and its interior. An anchored derivative of pyrene, 1-pyrenehexadecanoic acid (C(16)-pyr), is established for probing CPB films, where the pyrene moiety is preferentially oriented toward the micelle interior, thus limiting quenching by the pyridinium headgroup of CPB. CO(2) processing of CPB templated silica films results in an increase in the time scale for probe mobility, suggesting an increased time scale of silica condensation through CO(2) processing. The mobility of C(16)-pyr increases with pressure from gaseous to sc CO(2) processing and persists for over 5 h for sc CO(2) processing at 172 bar and 45 °C compared to about 25 min for the unprocessed film. The delivery of CO(2) soluble solutes to specific regions of surfactant templated mesoporous materials is examined via the nonradiative energy transfer (NRET) between pyrene and CO(2)-solubilized naphthalene.
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Affiliation(s)
- Kaustav Ghosh
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506-0046, USA
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Ghosh K, Lehmler HJ, Rankin SE, Knutson BL. Supercritical carbon dioxide swelling of fluorinated and hydrocarbon surfactant templates in mesoporous silica thin films. J Colloid Interface Sci 2012; 367:183-92. [DOI: 10.1016/j.jcis.2011.10.051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 10/21/2011] [Accepted: 10/22/2011] [Indexed: 10/15/2022]
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McManamon C, Burke AM, Holmes JD, Morris MA. Amine-functionalised SBA-15 of tailored pore size for heavy metal adsorption. J Colloid Interface Sci 2011; 369:330-7. [PMID: 22209347 DOI: 10.1016/j.jcis.2011.11.063] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2011] [Revised: 11/03/2011] [Accepted: 11/27/2011] [Indexed: 11/18/2022]
Abstract
This study examines the synthesis of SBA-15 with tailored pore sizes through controlled thermal treatment for the adsorption of Pb and Cd ions. The aim is to produce a material that can adsorb heavy metals at both high and low concentrations. The materials were characterised by means of N(2) physisorption, powder X-ray diffraction (PXRD), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), microanalysis and transmission electron microscopy (TEM). The surface areas ranged from 410 to 871 m(2)g(-1), and pore diameter was increased from 5.9 to 10.8 nm. This method allows for maximum adsorption of metal ions at very low concentrations. Metal ion adsorption was determined using an Atomic Absorption Spectrophotometer. The effects of pH were found to play a major role in the precipitation and, therefore, adsorption of metal ions. This method proved to be efficient at adsorbing large quantities of both metals (39 and 41 mg g(-1) for Pb and Cd, respectively).
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Affiliation(s)
- Colm McManamon
- Department of Chemistry, Supercritical Fluid Centre and Materials Section, University College Cork, Cork, Ireland
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Delaney P, McManamon C, Hanrahan JP, Copley MP, Holmes JD, Morris MA. Development of chemically engineered porous metal oxides for phosphate removal. JOURNAL OF HAZARDOUS MATERIALS 2011; 185:382-391. [PMID: 20934247 DOI: 10.1016/j.jhazmat.2010.08.128] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Revised: 07/26/2010] [Accepted: 08/26/2010] [Indexed: 05/30/2023]
Abstract
In this study, the application of ordered mesoporous silica (OMS) doped with various metal oxides (Zr, Ti, Fe and Al) were studied for the removal of (ortho) phosphate ions from water by adsorption. The materials were characterized by means of N(2) physisorption (BET), powder X-ray diffraction (PXRD) and transmission electron microscopy (TEM). The doped materials had surface areas between 600 and 700 m(2)g(-1) and exhibited pore sizes of 44-64 Å. Phosphate adsorption was determined by measurement of the aqueous concentration of orthophosphate using ultraviolet-visible (UV-vis) spectroscopy before and after extraction. The effects of different metal oxide loading ratios, initial concentration of phosphate solution, temperature and pH effects on the efficiency of phosphate removal were investigated. The doped mesoporous materials were effective adsorbents of orthophosphate and up to 100% removal was observed under appropriate conditions. 'Back extracting' the phosphate from the doped silica (following water treatment) was also investigated and shown to have little adverse effect on the adsorbent.
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Affiliation(s)
- Paul Delaney
- Department of Chemistry, Supercritical Fluid Centre and Materials Section, University College Cork, Cork, Ireland
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O'Callaghan JM, McNamara H, Copley MP, Hanrahan JP, Morris MA, Steytler DC, Heenan RK, Holmes JD. Swelling of ionic and nonionic surfactant micelles by high pressure gases. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7725-7731. [PMID: 20148596 DOI: 10.1021/la904464k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The influence of different solvent environments on the size, shape, and characteristics of surfactant micelles of Pluronic F127 and CTAB was investigated by small-angle neutron scattering (SANS). SANS experiments were undertaken on dilute micellar surfactant solutions of F127 and CTAB that between them were exposed to liquid and supercritical carbon dioxide, liquid propane, ethane, and heptane under various pressures and temperatures. Swelling of the surfactant micelles could be directly related to the solubility of the solvents within the micelles, especially within their cores. Carbon dioxide produced the largest swelling of the Pluronic F127 micelles, compared to propane and ethane, which mirrors the solubility of the gases in the PPO core of the micelles. Conversely, the extent of swelling of the cores of CTAB micelles was greater with propane compared to carbon dioxide, which again relates to the solubility of the solvents in the alkane core of the CTAB micelles.
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Affiliation(s)
- John M O'Callaghan
- Materials and Supercritical Fluids Group, Department of Chemistry, Tyndall National Institute, University College Cork, Cork, Ireland
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Li X, Vogt BD. Temperature dependence of CO2 concentration gradient within polymer films as determined by reactive templating. J Supercrit Fluids 2009. [DOI: 10.1016/j.supflu.2009.09.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Cansell F, Aymonier C. Design of functional nanostructured materials using supercritical fluids. J Supercrit Fluids 2009. [DOI: 10.1016/j.supflu.2008.10.002] [Citation(s) in RCA: 151] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zhao Y, Zhang J, Li W, Zhang C, Han B. Synthesis of uniform hollow silica spheres with ordered mesoporous shells in a CO2 induced nanoemulsion. Chem Commun (Camb) 2009:2365-7. [DOI: 10.1039/b822375k] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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O'Callaghan JM, Copley MP, Hanrahan JP, Morris MA, Steytler DC, Heenan RK, Staudt R, Holmes JD. Supercritical fluid swelling of liquid crystal films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:6959-6964. [PMID: 18512872 DOI: 10.1021/la800073t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The influence of liquid and supercritical carbon dioxide and liquid propane on the structural properties of both ionic and nonionic surfactant-based liquid crystal films is discussed in this paper. Swelling of the films, measured using in situ small-angle neutron scattering (SANS), was found to be dependent on the solubility of the propane/carbon dioxide in the micelles of the respective liquid crystals. Additionally, under certain pressure conditions the structural properties of some of the films were observed to change, ultimately leading to a loss of order in the micellar arrays of the liquid crystals.
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Affiliation(s)
- John M O'Callaghan
- Department of Chemistry, Material Section and Supercritical Fluid Centre, University College Cork, Cork, Ireland
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Trofimchuk ES, Nesterova EA, Meshkov IB, Nikonorova NI, Muzafarov AM, Bakeev NP. Polypropylene/Silicate Composites on the Basis of Crazed Polymer and Hyperbranched Polyethoxysiloxane. Macromolecules 2007. [DOI: 10.1021/ma071379d] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elena S. Trofimchuk
- Division of Polymer, Department of Chemistry, M.V. Lomonossov Moscow State University, Lenin Hills 1-3, Moscow 119991, Russia, and Institute of Synthetic Polymer Materials, Russian Academy of Science, Profsoyuznaya ul. 70, Moscow 117393, Russia
| | - Ekaterina A. Nesterova
- Division of Polymer, Department of Chemistry, M.V. Lomonossov Moscow State University, Lenin Hills 1-3, Moscow 119991, Russia, and Institute of Synthetic Polymer Materials, Russian Academy of Science, Profsoyuznaya ul. 70, Moscow 117393, Russia
| | - Ivan B. Meshkov
- Division of Polymer, Department of Chemistry, M.V. Lomonossov Moscow State University, Lenin Hills 1-3, Moscow 119991, Russia, and Institute of Synthetic Polymer Materials, Russian Academy of Science, Profsoyuznaya ul. 70, Moscow 117393, Russia
| | - Nina I. Nikonorova
- Division of Polymer, Department of Chemistry, M.V. Lomonossov Moscow State University, Lenin Hills 1-3, Moscow 119991, Russia, and Institute of Synthetic Polymer Materials, Russian Academy of Science, Profsoyuznaya ul. 70, Moscow 117393, Russia
| | - Aziz M. Muzafarov
- Division of Polymer, Department of Chemistry, M.V. Lomonossov Moscow State University, Lenin Hills 1-3, Moscow 119991, Russia, and Institute of Synthetic Polymer Materials, Russian Academy of Science, Profsoyuznaya ul. 70, Moscow 117393, Russia
| | - Nikolay Ph. Bakeev
- Division of Polymer, Department of Chemistry, M.V. Lomonossov Moscow State University, Lenin Hills 1-3, Moscow 119991, Russia, and Institute of Synthetic Polymer Materials, Russian Academy of Science, Profsoyuznaya ul. 70, Moscow 117393, Russia
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Hanrahan JP, Donovan A, Morris MA, Holmes JD. Synthesis and swelling of large pore diameter mesoporous silica spheres. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b705023b] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ghosh K, Vyas SM, Lehmler HJ, Rankin SE, Knutson BL. Tailoring Porous Silica Films through Supercritical Carbon Dioxide Processing of Fluorinated Surfactant Templates. J Phys Chem B 2006; 111:363-70. [PMID: 17214487 DOI: 10.1021/jp0656680] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The tailoring of porous silica thin films synthesized using perfluoroalkylpyridinium chloride surfactants as templating agents is achieved as a function of carbon dioxide processing conditions and surfactant tail length and branching. Well-ordered films with 2D hexagonal close-packed pore structure are obtained from sol-gel synthesis using the following cationic fluorinated surfactants as templates: 1-(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-octyl)pyridinium chloride (HFOPC), 1-(3,3,4,4,5,5,6,6,7,8,8,8-dodecafluoro-7-trifluoromethyl -octyl)pyridinium chloride (HFDoMePC), and 1-(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluoro-decyl)pyridinium chloride (HFDePC). Processing the sol-gel film with CO2 (69-172 bar, 25 and 45 degrees C) immediately after coating results in significant increases in pore diameter relative to the unprocessed thin films (increasing from 20% to 80% depending on surfactant template and processing conditions). Pore expansion increases with CO2 processing pressure, surfactant tail length, and surfactant branching. The varying degree of CO2 induced expansion is attributed to the solvation of the "CO2-philic" fluorinated tail and is interpreted from interfacial behavior of HFOPC, HFDoMePC, and HFDePC at the CO2-water interface.
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Affiliation(s)
- Kaustav Ghosh
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky 40506-0046, USA
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Aymonier C, Loppinet-Serani A, Reverón H, Garrabos Y, Cansell F. Review of supercritical fluids in inorganic materials science. J Supercrit Fluids 2006. [DOI: 10.1016/j.supflu.2006.03.019] [Citation(s) in RCA: 240] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Wang J, Xia Y, Wang W, Poliakoff M, Mokaya R. Synthesis of mesoporous silica hollow spheres in supercritical CO2/water systems. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b601301e] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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